[Model Request] Add CATS: official code included

[krishnapriya-18]

Description

Based on the paper: https://arxiv.org/pdf/2403.01673

Official code repo: https://github.com/LJC-FVNR/CATS/blob/main/CATS-Tutorial.ipynb

Use case

Enhancing Multivariate Time Series Forecasting by Constructing Auxiliary Time Series as Exogenous Variables